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• Table S.1 provides new 1961 herbaceous biomass data for the sagebrush mine <br />area. A total of 27-lmz plots were clipped, generating a mean and standard <br />deviation of 116.9 g/mz -` 45.3. This mean was higher than that measured on <br />the reference area (104.8 g/m2 19.6), but the means were not signifi- <br />cantly differ2nt at the 95% confidence level (see page 5). <br />Percent herbaceous foliage cover was measured on the sagebrush mine and <br />reference areas, as shown in Tables S.3 and 5.4. Cover estimates for 1981 <br />were combined with estimates from 1980 for both areas. As shown in the <br />tables, four additional transects were sampled in the mine area and three <br />in the reference area. Total vegetation cover was nearly the same in both <br />areas: 33.3% ± 6.1 in the mine area and 33.9% t 5.6 in the reference area. <br />Table S.5 lists shrub density data from 1980 and 1981 for the sagebrush <br />mine and reference areas. Two additional quadrats (nos. 5-6) were counted <br />in the mine area in 1981 to meet the statistical adequacy requirements. <br />The mean value of 105.8 t 16.1 stems per 50m= was changed only slightly <br />• with this additional data. <br />In the Gambel oak community, additional woody plant density sampling was <br />conducted on the mine area. as shown in Table 0.5. Additional data was <br />added for quadrats 5-9. Quadrats 5 and 6 were counted for shrub density in <br />1980 but were inadvertently left out of the data table in the original <br />report. Quadrats 7-9 were counted in 1981, with quadrat 9 counted only for <br />tree density. The combined data, eight quadrats for shrub and seedling <br />density and seven quadrats for tree density, allow the sample adequacy <br />requirements_to be met. The mean density of shrubs was 129.9 t 24.2 per 50 <br />m2, while mean tree density was 43.1 t 1.2 per 100 m2. <br />One additional quadrat (no. 5) was sampled in the chokecherry community <br />(Table C.5), which allowed the sample adequacy requirement to be met for <br />the mine area. The mean density of shrubs and seedlings was 147.8 t 20.4 <br />per 5Qn2 quadrat. . <br /> <br />631C4 <br />